A couple of changes this year:
1) No more "Buddy Tickets" for Spring renewal (used to be you got 4 for $50- that you could use all year) Now there are just the 6 variably priced "Ski with a friend" tickets.
2) No more "Peaks" points for purchase (last year you got 10,000 points which equalled 1 free lift ticket.)
If you purchase by April 12th- last year's price is guaranteed- $579 (although they frequently extend this price until May)
BTW: The Colorado Pass Spring renewal still has the 4 "Buddy Tickets" but they will be $59 this year